CN112483910A - Gas-liquid two-phase flow pipeline leakage simulation device based on sound-pressure coupling - Google Patents
Gas-liquid two-phase flow pipeline leakage simulation device based on sound-pressure coupling Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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Abstract
The invention relates to a gas-liquid two-phase flow pipeline leakage simulation device based on sound-pressure coupling, which comprises a control system, a data processing system, a leakage device, a detection device and a simulation pipeline, wherein a gas-liquid two-phase flow medium is generated in the simulation pipeline, the control system realizes the opening and closing of an electromagnetic valve in the leakage device, a sensor in the detection device is applied to a multiphase flow medium two-phase flow pipeline, a received signal is processed by the data processing system, the cross-correlation analysis is carried out according to the time difference of the signal, the leakage positioning of the simulation pipeline is realized, and the leakage position obtained by analysis and the actual position are verified and adjusted in time. The invention respectively enters the gas and the liquid separated from the separator into the simulation pipeline, better simulates the authenticity of leakage by arranging a plurality of leakage pipes at different positions on the outer wall of the simulation pipeline, and realizes the positioning of the pipeline leakage by carrying out leakage analysis and judgment by a method of combining an acoustic signal and a dynamic pressure signal.
Description
Technical Field
The invention relates to the technical field of pipeline leakage detection, in particular to a gas-liquid two-phase flow pipeline leakage simulation device based on sound-pressure coupling.
Background
The submarine pipelines in China comprise petroleum and natural gas transportation, gas-liquid mixed transportation and other types, and are easy to age, corrode and leak due to the complex submarine environment. In order to prevent economic, environmental and personal hazards caused by leakage of the submarine pipeline, the leakage condition of the submarine pipeline needs to be monitored in time, but due to the fact that a plurality of variable factors exist in the seabed, a plurality of challenges are brought to submarine pipeline monitoring. At present, the leakage condition of a pipeline is mainly monitored by adopting modes such as engineering geophysical prospecting, artificial diving, in-pipe monitoring and the like, and the methods have the problems of difficulty in real-time monitoring, high cost, low precision, difficulty in positioning and the like. Therefore, at present, people do not know the behavior state of oil spilling after the leakage of the submarine pipeline and the evolution law thereof sufficiently, and a large number of test simulations are needed.
Since 1991, scholars at home and abroad have conducted a great deal of research on pipeline leakage detection, and research on single-phase medium pipelines mainly used for oil and gas transportation is conducted, while related research on the condition that two-phase or multi-phase fluid exists in the pipelines is less. Two-phase flow or multi-phase flow phenomena such as bubble flow, gas mass flow, even slug flow and the like are often formed in the flowing process of the gas pipeline and the oil pipeline, but the influence of the factors is generally ignored in the existing pipeline leakage detection research. The single-phase medium infusion and gas transmission pipeline is greatly different from a gas-liquid two-phase flow pipeline, and the sounding mechanism is more complex when the gas-liquid two-phase pipeline leaks, so that the leakage detection of the single-phase medium infusion and gas transmission pipeline and the leakage detection of the gas-liquid two-phase flow pipeline are not completely the same, and the stable flow process and the leakage process before and after the leakage are both different from those of the single-phase medium pipeline. On one hand, the single-phase medium pipeline, particularly the gas transmission pipeline, has almost no other dynamic pressure fluctuation in the stable flowing process of the pipeline due to the extremely strong gas diffusivity; a gas-liquid phase interface exists in the gas-liquid two-phase flow pipeline, and the two phases interact with each other, so that dynamic pressure fluctuation caused by the fluid in the gas-liquid two-phase flow pipeline in the stable flowing process is far larger than that of a single-phase medium pipeline. On the other hand, if the pipeline leaks, the single-phase medium pipeline generates sudden acoustic emission signal fluctuation which is extremely obvious; the gas-liquid two-phase flow characteristics of the gas-liquid two-phase pipeline are changed, parameters of a flow field are changed, and a new gas-liquid two-phase flow state is achieved after leakage. Therefore, at present, people do not know the behavior state of oil spilling after the leakage of the submarine pipeline and the evolution law thereof sufficiently, and a large number of simulation tests are needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a gas-liquid two-phase flow pipeline leakage simulation device based on sound-pressure coupling, so as to solve the defects of a multiphase flow pipeline leakage processing method in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a gas-liquid two-phase flow pipeline leakage simulation device based on sound-pressure coupling comprises a control system, a data processing system, a simulation pipeline, a leakage device and a detection device, wherein,
the control system comprises: is provided with an upper computer and a switch control device;
a data processing system: the device is provided with a demodulating device, demodulates the obtained sound wave signal and pressure signal to obtain a digital signal, and transmits the digital signal to a control system after further analysis and processing;
simulating a pipeline: a separator which is connected with the simulation pipeline and respectively transmits gas and liquid to form gas-liquid two-phase flow;
a leakage device: the simulation pipeline leakage simulation device comprises a plurality of leakage pipes distributed around the outer wall of a simulation pipeline, wherein the outlet ends of the leakage pipes are connected with electromagnetic valves for controlling the on-off of the leakage pipes, and the electromagnetic valves are electrically connected with a switch control device of a control system;
the detection device comprises: the device comprises sensor groups which are respectively arranged at two ends of a simulation pipeline, and the sensor groups are electrically connected with a data processing system.
Specifically, the feed end of the simulation pipeline is connected with a buffer tank, the discharge end of the simulation pipeline is connected with the feed end of the separator through a pipeline, a first compressor and a gas heat exchanger are arranged between the buffer tank and the gas-phase outlet end of the separator, the gas inlet end of the first compressor is connected with the pipeline of the separator, the gas outlet end of the first compressor is connected with the gas inlet end of the gas heat exchanger through a pipeline, and the gas outlet end of the gas heat exchanger is connected with the gas inlet end of the buffer tank through a pipeline; and a first centrifugal pump is arranged between the buffer tank and the liquid phase outlet end of the separator, the liquid inlet end of the first centrifugal pump is connected with a pipeline of the separator, and the liquid outlet end of the first centrifugal pump is connected with a pipeline of the liquid inlet end of the buffer tank.
Furthermore, the upper end of the separator is connected with a high-pressure gas cylinder group for maintaining the pressure of the system stable through a second compressor.
The simulation pipeline is externally coated with a heat insulation sleeve pipe with an internal water/ethylene glycol mixed liquid refrigerating medium, a discharge end pipeline of the simulation pipeline is connected with a second centrifugal pump, an air inlet end of the second centrifugal pump is connected with water bath refrigeration, and a water bath refrigeration pipeline is connected to a feed end of the simulation pipeline.
In order to realize that the leakage pipes can respectively face different positions and improve the simulation effect, the leakage pipes can be arranged at the upper part, the lower part or two sides of the outer wall of the simulation pipeline.
Preferably, the sensor group include sound wave sensor and dynamic pressure sensor, be located the simulation pipeline inner wall and install the tracking dog that the cooperation sound wave sensor screened out flowing background noise.
The invention has the beneficial effects that: the gas and the liquid separated from the separator respectively enter the simulation pipeline, the authenticity of leakage is better simulated by arranging a plurality of leakage pipes at different positions on the outer wall of the simulation pipeline, and the leakage is analyzed and judged by a method of combining an acoustic signal and a dynamic pressure signal to realize the positioning of pipeline leakage; by using the control system, the automatic control of the test is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic flow diagram of the present invention.
Fig. 2 is a schematic structural diagram of the simulated pipeline of the present invention.
Fig. 3 is a schematic view of the installation structure of the leakage apparatus and the detection apparatus according to the present invention.
In the figure: 1. the system comprises a control system, 2, a data processing system, 3, an analog pipeline, 3-1, a separator, 3-2, a buffer tank, 3-3, a first compressor, 3-4, a gas heat exchanger, 3-5, a first centrifugal pump, 3-6, a second compressor, 3-7, a high-pressure gas bottle group, 3-8, a second centrifugal pump, 3-9, water bath refrigeration, 4, a leakage device, 4-1, a leakage pipe, 4-2, an electromagnetic valve, 5, a detection device, 5-1, a sensor group, 5-2, a sound wave sensor, 5-3, a dynamic pressure sensor and 5-4 tracking dogs.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The gas-liquid two-phase flow pipeline leakage simulation device based on sound-pressure coupling shown in fig. 1 comprises a control system 1, a data processing system 2, a simulation pipeline 3, a leakage device 4 and a detection device 5.
The control system 1 is provided with an upper computer and a switch control device, and the upper computer is in communication connection with the data processing system 2; the data processing system 2 is provided with a demodulating device, demodulates the obtained sound wave signals and pressure signals to obtain digital signals, and transmits the digital signals to the control system 1 after further analysis and processing.
As shown in fig. 2, the simulated pipe 3 is connected to a separator 3-1 for delivering gas and liquid into the simulated pipe 3 to form a gas-liquid two-phase flow. Specifically, a feed end of the simulation pipeline 3 is connected with a buffer tank 3-2 for stabilizing flowing media and avoiding flow fluctuation influence, a discharge end of the simulation pipeline 3 is connected with a feed end of a separator 3-1 through a pipeline, a first compressor 3-3 and a gas heat exchanger 3-4 are arranged between the buffer tank 3-2 and a gas phase outlet end of the separator 3-1, a gas inlet end of the first compressor 3-3 is connected with a top pipeline of the separator 3-1 through a valve, a gas outlet end of the first compressor 3-3 is connected with a gas inlet end of the gas heat exchanger 3-4 through a pipeline, and a mass flow meter and a pressure meter are arranged on a pipeline between the first compressor 3-3 and the gas heat exchanger 3-4 to measure mass flow and pressure of gas respectively;
the gas outlet end of the gas heat exchanger 3-4 is connected with a gas inlet end pipeline at the bottom of the buffer tank 3-2 and used for controlling the temperature of a gas phase and a liquid phase injected into the simulation pipeline 3; a first centrifugal pump 3-5 is arranged between the buffer tank 3-2 and the liquid phase outlet end of the separator 3-1, the liquid inlet end of the first centrifugal pump 3-5 is connected with the separator 3-1 through a pipeline to increase the driving force for the liquid medium, a mass flow meter and a pressure meter are arranged at the outlet of the first centrifugal pump 3-5 to respectively measure the mass flow and the pressure of the liquid, and the liquid outlet end of the first centrifugal pump 3-5 is connected with the liquid inlet end of the buffer tank 3-2 through a pipeline.
The upper end of the separator 3-1 is connected with a high-pressure gas cylinder group 3-7 for maintaining the separator 3-1 and the system pressure stable through a second compressor 3-6.
The simulation pipeline 3 is externally coated with a heat insulation sleeve pipe with an internal water/ethylene glycol mixed liquid refrigerating medium, a pipeline at the discharge end of the simulation pipeline 3 is connected with a second centrifugal pump 3-8, a pipeline at the air inlet end of the second centrifugal pump 3-8 is connected with a water bath refrigerating 3-9, and a pipeline at the water bath refrigerating 3-9 is connected to the feed end of the simulation pipeline 3.
As shown in fig. 3, the leakage device 4 comprises a plurality of leakage pipes 4-1 distributed around the outer wall of the simulation pipeline 3, and the leakage pipes 4-1 can be arranged on the upper part, the lower part or both sides of the outer wall 3 of the simulation pipeline, so that each leakage pipe 4-1 faces to different positions of the simulation pipeline 3, and the authenticity of the leakage is better simulated.
In this embodiment, the plurality of leakage pipes 4-1 are divided into two rows, and are approximately symmetrically distributed on the side wall of the simulation pipeline 3, meanwhile, the leakage pipes 4-1 are arranged along the axial direction of the simulation pipeline 3, the leakage ports of the leakage pipes 4-1 face different directions respectively, the leakage at different positions of the simulation pipeline 3 can be simulated, and the leakage pipes 4-1 can be distributed at equal intervals. Further, the leakage opening of the leakage pipe 4-1 can be in different slit shapes, such as a circular hole, a straight slit or an irregular shape, so that the leakage condition of the leakage opening in different shapes on the pipeline can be simulated by using the simulation device in a single test.
The outlet end of the leakage pipe 4-1 is in threaded connection with an electromagnetic valve 4-2 for controlling the on-off of the leakage pipe 4-1, and the electromagnetic valve 4-2 is electrically connected with a switch control device of the control system 1, so that the remote control and the simulation automation of the on-off are realized.
The detection device 5 is provided with sensor groups 5-1 which are respectively arranged at two ends of the simulation pipeline 3, and the sensor groups 5-1 are electrically connected with the data processing system 2.
The sensor group 5-1 comprises an acoustic wave sensor 5-2 and a dynamic pressure sensor 5-3, and the dynamic pressure sensor 5-3 is used for acquiring clear and reliable dynamic pressure signals in the pipeline leakage process. The leakage judgment is carried out by analyzing the amplitude and the frequency variation of the sound wave signals collected by the sound wave sensor 5-2 and the dynamic pressure sensor 5-3, and the positioning of the pipeline leakage is realized by carrying out cross-correlation analysis on the amplitude attenuation and the time difference of the signals collected by the sensors at different positions.
The inner wall of the simulation pipeline 3 is provided with a tracking dog 5-4 matched with the sound wave sensor 5-2 to screen out flowing background noise, the tracking dog 5-4 can measure the environmental pressure noise generated by fluid flowing and a compressor, information is carried to a signal source, and most of flowing background noise can be effectively screened out by analyzing and comparing the sound wave signal received by the sound wave sensor 5-2 and the signal acquired by the tracking dog 5-4.
The simulation device can also simulate different simulation results generated by different flow patterns and other factors according to the fluctuation value of the transmission signal of the sensor.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. A gas-liquid two-phase flow pipeline leakage simulation device based on sound-pressure coupling comprises a control system (1), a data processing system (2), a simulation pipeline (3), a leakage device (4) and a detection device (5), and is characterized in that:
control system (1): is provided with an upper computer and a switch control device;
data processing system (2): the device is provided with a demodulating device, demodulates the obtained sound wave signal and pressure signal to obtain a digital signal, and transmits the digital signal to a control system (1) after further analysis and processing;
simulated duct (3): a separator (3-1) which is connected with the simulation pipeline (3) and respectively transmits gas and liquid to form gas-liquid two-phase flow;
leakage device (4): the device comprises a plurality of leakage pipes (4-1) distributed around the outer wall of a simulation pipeline (3), the outlet ends of the leakage pipes (4-1) are connected with electromagnetic valves (4-2) for controlling the on-off of the leakage pipes (4-1), and the electromagnetic valves (4-2) are electrically connected with a switch control device of a control system (1);
detection device (5): the device is provided with sensor groups (5-1) which are respectively arranged at two ends of a simulation pipeline (3), wherein the sensor groups (5-1) are electrically connected with a data processing system (2).
2. The device for simulating the leakage of the gas-liquid two-phase flow pipeline based on the acoustic-pressure coupling as claimed in claim 1, wherein: the device is characterized in that the feed end of the simulation pipeline (3) is connected with a buffer tank (3-2), the discharge end of the simulation pipeline (3) is connected with the feed end of the separator (3-1) through a pipeline, a first compressor (3-3) and a gas heat exchanger (3-4) are arranged between the buffer tank (3-2) and the gas phase outlet end of the separator (3-1), the gas inlet end of the first compressor (3-3) is connected with the separator (3-1) through a pipeline, the gas outlet end of the first compressor (3-3) is connected with the gas inlet end of the gas heat exchanger (3-4) through a pipeline, and the gas outlet end of the gas heat exchanger (3-4) is connected with the gas inlet end of the buffer tank (3-2) through a pipeline; a first centrifugal pump (3-5) is arranged between the buffer tank (3-2) and the liquid phase outlet end of the separator (3-1), the liquid inlet end of the first centrifugal pump (3-5) is connected with the separator (3-1) through a pipeline, and the liquid outlet end of the first centrifugal pump (3-5) is connected with the liquid inlet end of the buffer tank (3-2) through a pipeline.
3. The device for simulating the leakage of the gas-liquid two-phase flow pipeline based on the acoustic-pressure coupling as claimed in claim 2, wherein: the upper end of the separator (3-1) is connected with a high-pressure gas cylinder group (3-7) for maintaining the pressure of the system stable through a second compressor (3-6).
4. The device for simulating the leakage of the gas-liquid two-phase flow pipeline based on the acoustic-pressure coupling as claimed in claim 1, wherein: the simulation pipeline (3) is externally coated with a heat-insulating sleeve pipe containing an internal water/ethylene glycol mixed liquid refrigerating medium, a discharge end pipeline of the simulation pipeline (3) is connected with a second centrifugal pump (3-8), an air inlet end of the second centrifugal pump (3-8) is connected with a water-bath refrigerating (3-9), and a water-bath refrigerating (3-9) pipeline is connected to a feed end of the simulation pipeline (3).
5. The device for simulating the leakage of the gas-liquid two-phase flow pipeline based on the acoustic-pressure coupling as claimed in claim 1, wherein: the leakage pipe (4-1) can be arranged at the upper part, the lower part or two sides of the outer wall (3) of the simulation pipeline.
6. The device for simulating the leakage of the gas-liquid two-phase flow pipeline based on the acoustic-pressure coupling as claimed in claim 1, wherein: the sensor group (5-1) comprises an acoustic wave sensor (5-2) and a dynamic pressure sensor (5-3), and a tracking dog (5-4) which is positioned on the inner wall of the simulation pipeline (3) and is matched with the acoustic wave sensor (5-2) to screen out flowing background noise is arranged.
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